CN108129158A - A kind of charcoal-charcoal thin-walled porous member and preparation method thereof - Google Patents
A kind of charcoal-charcoal thin-walled porous member and preparation method thereof Download PDFInfo
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- CN108129158A CN108129158A CN201711465580.1A CN201711465580A CN108129158A CN 108129158 A CN108129158 A CN 108129158A CN 201711465580 A CN201711465580 A CN 201711465580A CN 108129158 A CN108129158 A CN 108129158A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/71—Ceramic products containing macroscopic reinforcing agents
- C04B35/78—Ceramic products containing macroscopic reinforcing agents containing non-metallic materials
- C04B35/80—Fibres, filaments, whiskers, platelets, or the like
- C04B35/83—Carbon fibres in a carbon matrix
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/515—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics
- C04B35/52—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on carbon, e.g. graphite
- C04B35/522—Graphite
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/60—Aspects relating to the preparation, properties or mechanical treatment of green bodies or pre-forms
- C04B2235/602—Making the green bodies or pre-forms by moulding
- C04B2235/6028—Shaping around a core which is removed later
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Abstract
The present invention provides a kind of preparation methods of charcoal charcoal thin-walled porous member, and carbon fiber prepreg is wrapped on mold core, obtains precast body；The material of the mold core is macromolecule solid-state thermal expansion material；The precast body is placed in progress solidifying and setting processing in external mold, external mold is removed, obtains solidifying and setting body；The solidifying and setting body is subjected to charing process, obtains blank；The blank is subjected to graphitization processing, obtains charcoal charcoal thin-walled porous member.Method provided by the invention is suitable for preparing large scale charcoal charcoal thin-walled porous member, and the consistency of product quality is good, mechanical property is good and with short production cycle, production cost is low, is easy to large-scale production.
Description
Technical field
The present invention relates to carbon fiber composite technical field more particularly to a kind of charcoal-charcoal thin-walled porous member and its preparations
Method.
Background technology
In recent years, being constantly progressive with carbon fiber composite technology of preparing, in powder metallurgy, photovoltaic, material
The application of the industries such as heat treatment is also more and more extensive.In particular with main production equipments used in these industries --- each type high temp
The design size of stove (vacuum drying oven, pressure stove, polycrystalline ingot furnace, monocrystal growing furnace, soldering oven etc.) becomes increasing, structure
It becomes increasingly complex, higher requirement also is proposed to the manufacturing process of carbon fiber composite and properties of product accordingly, mainly
It is embodied in following aspect：First, product size bigger, while also to ensure that there is good mechanical property under high temperature, so
It can guarantee the can match of thermal field component in large scale high-temperature service；Secondly, the designability of preparation process is strong, with high temperature
The function of equipment is constantly promoted perfect, and the design of structure also becomes increasingly complex, and the use of corresponding special-shaped component is also got over
Come more, and the making of these special-shaped components often has no idea to realize (even if energy by the method for conventional mechanical processing
Realize that requirement that may also be to process equipment excessively high causes the processing cost high), it is necessary to it is protected by programmable preparation process
Barrier；Finally, preparation process must also be of low cost, reliable and stable, due to the irreversibility of carbon fiber composite preparation process
(once there are substandard products, can not repair, and raw material cannot recycle), it is desirable that its preparation process must be reliable and stable, and lumber recovery is high.
At present, preparing large scale charcoal-charcoal thin-walled porous member mainly has following two techniques：
One：The carbon fiber prepreg of 0.20~0.5mm thickness is directly used, is required according to the size of product in designed gold
Belong to Wrapping formed on mold, the precast body lay out in parallel for then winding more simultaneously clamps, then pressurize on flat-bed press
Then heating, solidifying and setting demould, the precast body that demoulding obtains is pressed with graphite cake into high temperature furnace and is carbonized, and last trimming is beaten
Mill obtains product.
Two：According to the shape and size of product, the Carbon fibe puncturing structure precast body of respective shapes and size is directly customized
(three-dimensional puncturing structure precast body) then carries out Carbon fibe puncturing structure precast body chemical vapor deposition density and shapes, fixed
Precast body after type can be finished after 2~3 times deposit density by drawing size, directly be used after the completion of finishing
Or it is used after according to product density and surface topography carrying out coating treatment.
But it when using the first technique preparation large scale charcoal-charcoal thin-walled porous member, needs to be wound in using metal die
Type, therefore size, precision, surface smoothness to metal die etc. has very high requirement, the expense meeting of metal die customization
Production cost is caused to increase.And since solidifying and setting process needs to realize using the pressurization heating of tablet moulding press, due to tablet
The limitation of mould pressing process causes charcoal-charcoal thin-walled porous member after sizing only to have in parallel mold pressing surface (i.e. upper and lower surface) good
Good performance, and in vertical mold pressing surface only winding and fixture pressure, and easily carbonized for the inadequate position of pressure by hand
During occur being layered or deform, it is difficult to ensure that the consistency of product quality.Further, since a large amount of metal die, tooling, folders
The use of tool causes in entire preparation process, and movement, the transport of product must be realized by mechanical equipment, operability
Poor, production efficiency is relatively low.
When preparing large scale charcoal-charcoal thin-walled porous member using second of technique, first to the requirement of the knitting skill of precast body
Higher different with common 2.5 dimension needling structure precast bodies, three-dimensional puncturing structure precast body needs a large amount of sewn by hand to make
Industry, low production efficiency, cost of manufacture are high, and the puncturing structure precast body of similary weight is the 10 of needling structure precast body price
Times.Secondly as chemical vapor deposition density setting process is not belonging to near-net-shape technique, product size and shape still need
Precision Machining process ensures that this just proposes precision machined equipment and cost very high requirement, particularly large-sized
Charcoal-charcoal thin-walled porous member is easily deformed during processing, and the current country is also difficult to find suitable process equipment.In addition,
Since mechanical processing will necessarily destroy the continuity of prefabricated surface layer Carbon fibe, can also shadow be caused to the final mechanical property of product
It rings.
To sum up, asking for large scale charcoal-charcoal thin-walled porous member generally existing production cost height and properties of product difference is prepared at present
Topic.
Invention content
The purpose of the present invention is to provide a kind of charcoal-charcoal thin-walled porous members and preparation method thereof, and use is provided by the invention
Method can prepare large scale charcoal-charcoal thin-walled porous member, and production cost is low, good product performance.
In order to achieve the above-mentioned object of the invention, the present invention provides following technical scheme：
The present invention provides a kind of preparation methods of charcoal-charcoal thin-walled porous member, include the following steps：
(1) carbon fiber prepreg is wrapped on mold core, obtains precast body；The material of the mold core is macromolecule solid state heat
Expanding material；
(2) precast body in the step (1) is placed in progress solidifying and setting processing in external mold, removes external mold, consolidate
Change forming body；
(3) the solidifying and setting body in the step (2) is subjected to charing process, obtains blank；
(4) blank in the step (3) is subjected to graphitization processing, obtains charcoal-charcoal thin-walled porous member.
Preferably, charcoal cloth used in the carbon fiber prepreg in the step (1) includes plain weave charcoal cloth, twill charcoal cloth or satin weave
Charcoal cloth；The specification of the charcoal cloth includes 3K, 6K or 12K.
Preferably, pre- impregnation used in the carbon fiber prepreg in the step (1) includes phenolic resin, epoxy resin, benzene
Bing oxazines resin or furane resins；The mass content of pre- impregnation is 40~50% in the carbon fiber prepreg.
Preferably, the macromolecule solid-state thermal expansion material in the step (1) includes polyvinyl chloride, polystyrene, poly- ammonia
Ester, polyetherimide, polymethyl methacrylate or modified solid epoxy resin.
Preferably, solidifying and setting processing includes the carry out successively first heat treatment and the second heat treatment in the step (2)；
First heat treatment is softening temperature that mold core is at the uniform velocity warming up in 1~2h, second heat treatment be in 0.5h from
The softening temperature of mold core is at the uniform velocity warming up to the solidification temperature of carbon fiber prepreg, keeps the temperature 1~2h.
Preferably, charing process carries out in protective atmosphere in the step (3), and the temperature of the charing process is 800
~1300 DEG C, the time of the charing process is 3~10h.
Preferably, graphitization processing carries out in protective atmosphere in the step (4), and the temperature of the graphitization processing is
1800~2500 DEG C, the time of the graphitization processing is 2~8h.
Preferably, in the step (4) surface grinding process is further included after graphitization processing.
Preferably, face coat sealing pores are further included after the surface grinding process.
The charcoal being prepared the present invention provides the preparation method described in above-mentioned technical proposal-charcoal thin-walled porous member.
The present invention provides a kind of preparation methods of charcoal-charcoal thin-walled porous member, and carbon fiber prepreg is wrapped on mold core,
Obtain precast body；The material of the mold core is macromolecule solid-state thermal expansion material；The precast body is placed in external mold and is consolidated
Change sizing treatment, remove external mold, obtain solidifying and setting body；The solidifying and setting body is subjected to charing process, obtains blank；It will
The blank carries out graphitization processing, obtains charcoal-charcoal thin-walled porous member.Big ruler can be prepared using method provided by the invention
Very little charcoal-charcoal thin-walled porous member, production cost is low, and good product performance is easy to large-scale production.Specifically, it is provided by the invention
Near-net-shape is wound using Carbon fibe prepreg when method prepares precast body, compared to Carbon fibe entirety felt precast body, raw material
Price is less expensive, and production cost is lower.The present invention is using the solidifying and setting processing method of double mould pressing inside and outside thermal expansion, operation letter
It is single, compared with conventional chemical vapor density setting process, the production cycle 20~30% can be shortened, reduction production cost 15~
20%.Meanwhile the present invention is using the solidifying and setting processing method of double mould pressing inside and outside thermal expansion, it is ensured that gained charcoal-charcoal thin-walled is more
The quality conformance of orifice is more preferable, and particularly when preparing the large scale product more than 1m, the density contrast of different parts is controllable
System is in 0.01g/cm3, the problem of charcoal-charcoal thin-walled porous member quality conformance is poor in the prior art is avoided, such as conventional chemical gas
Mutually deposition density setting process in, due to existing gas-phase deposition it is intrinsic the shortcomings that：Along the flowing side of deposition charcoal source gas
To the deposition efficiency of different parts is different, and the density for leading to each position of identical product is different from performance, and product size is bigger, poor
It is different more apparent；For another example in conventional panel molding setting process, in vertical mold pressing surface, only winding and fixture press by hand, and for
The inadequate position of pressure easily occurs being layered or be deformed during charing, it is difficult to ensure that the consistency of product quality.In addition,
The present invention prepares charcoal-charcoal thin-walled porous member, products obtained therefrom surface using the solidifying and setting processing method of double mould pressing inside and outside thermal expansion
It need not carry out finishing processing, the Carbon fibe continuity of product surface is not destroyed, and mechanical property is more preferable, and bending strength can be with
Reach 110MPa；And if using conventional chemical vapor density setting process, product also needs to carry out finishing processing, this
The continuity of prefabricated surface layer Carbon fibe will necessarily be destroyed, the bending strength of final products obtained therefrom generally can only achieve 80MPa.
Description of the drawings
Fig. 1 is the schematic diagram that charcoal-charcoal thin-wall boards with parallel square hole are prepared using method provided by the invention.
Specific embodiment
The present invention provides a kind of preparation methods of charcoal-charcoal thin-walled porous member, include the following steps：
(1) carbon fiber prepreg is wrapped on mold core, obtains precast body；The material of the mold core is macromolecule solid state heat
Expanding material；
(2) precast body in the step (1) is placed in progress solidifying and setting processing in external mold, removes external mold, consolidate
Change forming body；
(3) the solidifying and setting body in the step (2) is subjected to charing process, obtains blank；
(4) blank in the step (3) is subjected to graphitization processing, obtains charcoal-charcoal thin-walled porous member.
Carbon fiber prepreg is wrapped on mold core by the present invention, obtains precast body；The material of the mold core is macromolecular solid
State thermal expansion material.The present invention does not have the type of charcoal cloth used in the carbon fiber prepreg special restriction, using ability
Charcoal cloth known to field technique personnel.In the present invention, the charcoal cloth preferably includes plain weave charcoal cloth, twill charcoal cloth or satin weave charcoal
Cloth.The present invention does not have special restriction for the specification of the charcoal cloth, is using charcoal cloth specification well known to those skilled in the art
It can.In the present invention, the specification of the charcoal cloth preferably includes 3K, 6K or 12K.The present invention is for the no spy in the source of the charcoal cloth
Different restriction, using commercial goods well known to those skilled in the art.
The present invention does not have special restriction for the type of impregnation pre- used in the carbon fiber prepreg, using this field skill
Pre- impregnation known to art personnel.In the present invention, the pre- impregnation preferably includes phenolic resin, epoxy resin, the third Evil of benzene
Piperazine resin or furane resins.In the present invention, the mass content of pre- impregnation is preferably 40~50% in the carbon fiber prepreg,
More preferably 42~48%, most preferably 44~46%.
In the present invention, the material of the mold core is macromolecule solid-state thermal expansion material, preferably includes polyvinyl chloride, polyphenyl
Ethylene, polyurethane, polyetherimide, polymethyl methacrylate or modified solid epoxy resin.In the present invention, the modification
Modifying agent in solid epoxy resin preferably includes polyurethane, phenolic resin, furfural resin or vinyl；The modified solid-state
The mass content of modifying agent is preferably 8~12% in epoxy resin, and more preferably 10%.The present invention is preferably according to charcoal-charcoal thin-walled
The actual size of internal holes in porous member product cuts the macromolecule solid-state thermal expansion material of identical size as mold core.
The present invention does not have the mode of the winding special restriction, using winding side well known to those skilled in the art
Formula.The present invention determines the carbon fiber prepreg in mold core preferably according to the actual size of charcoal-charcoal thin-walled porous member product
The number of plies of upper winding；In the present invention, the number of plies is preferably 5~7 layers.
After obtaining precast body, the precast body is placed in progress solidifying and setting processing in external mold by the present invention, is removed external mold, is obtained
To solidifying and setting body.The present invention does not have the material of the external mold special restriction, and use is well known to those skilled in the art
It can be adapted to the material as external mold；Present invention preferably employs stainless steel external molds.The present invention is preferably more according to charcoal-charcoal thin-walled
The actual size of orifice product, the size of design external mold.In an embodiment of the present invention, specifically stainless steel plate is cleaned
After carry out chrome-faced, then again in one layer of releasing agent of surface spraying, after making sealing pores welding obtain external mold.The present invention for
The releasing agent does not have special restriction, using releasing agent well known to those skilled in the art, it is specific such as zinc stearate or
Polyethylene glycol.
In the present invention, the solidifying and setting processing preferably includes the carry out successively first heat treatment and the second heat treatment；
First heat treatment is softening temperature that mold core is at the uniform velocity warming up in 1~2h, second heat treatment be in 0.5h from
The softening temperature of mold core is at the uniform velocity warming up to the solidification temperature of carbon fiber prepreg, keeps the temperature 1~2h.In the present invention, the mold core
Softening temperature be preferably 90~120 DEG C, more preferably 100~110 DEG C.In the present invention, the carbon fiber prepreg is consolidated
It is preferably 120~180 DEG C to change temperature, more preferably 130~170 DEG C, most preferably 140~160 DEG C.In the present invention, it is described
Solidifying and setting processing carries out preferably in air dry oven.After completing the solidifying and setting processing, the preferred Temperature fall of the present invention
External mold is removed again after to less than 80 DEG C, obtains solidifying and setting body.In the present invention, during solidifying and setting processing,
Mold core can expand, and with external mold collective effect in carbon fiber prepreg, squeezing carbon fiber prepreg makes its compacting-shaping, makes
The quality conformance of final gained charcoal-charcoal thin-walled porous member is more preferable, particularly more more than large scale charcoal-charcoal thin-walled of 1m in preparation
During orifice, the density contrast of different parts can be controlled in 0.01g/cm3It is interior.
After obtaining solidifying and setting body, the solidifying and setting body is carried out charing process by the present invention, obtains blank.In this hair
In bright, the charing process carries out preferably in protective atmosphere.The present invention the protective gas for not providing the protective atmosphere
Have special restriction, using it is well known to those skilled in the art be suitable for carry out charing process protective gas, specifically such as
Nitrogen.In the present invention, the temperature of the charing process is preferably 800~1300 DEG C, more preferably 900~1200 DEG C, optimal
It is selected as 1000~1100 DEG C；The time of the charing process is preferably 3~10h, more preferably 4~9h, most preferably 5~8h.
In the present invention, the charing process can be by resin materials all in solidifying and setting body (including mold core and carbon fiber prepreg
Used in pre- impregnation) charing.
After obtaining blank, the blank is carried out graphitization processing by the present invention, obtains charcoal-charcoal thin-walled porous member.
In the present invention, the graphitization processing carries out preferably in protective atmosphere.Protection of the present invention for the offer protective atmosphere
Gas does not have special restriction, is using the protective gas well known to those skilled in the art for being suitable for carrying out graphitization processing
Can, it is specific such as argon gas.In the present invention, the temperature of the graphitization processing is preferably 1800~2500 DEG C, more preferably 1900
~2400 DEG C, most preferably 2100~2200 DEG C；The time of the graphitization processing is preferably 2~8h, more preferably 3~7h,
Most preferably 4~6h.
In the present invention, surface grinding process is preferably further included after the graphitization processing.The present invention is for the surface
The mode of grinding process is not particularly limited, and the technical solution using surface grinding process well known to those skilled in the art is
It can.In an embodiment of the present invention, specifically by gained graphitization blank after graphitization processing according to the design of product drawing
Then size cut end mouth polishes to its outer surface with the sand paper of 400~600 mesh, and mold core in its hole that cleans with a brush
The remaining charcoal after graphitization processing obtains charcoal-charcoal thin-walled porous member.
In the present invention, according to actual needs, face coat sealing pores are preferably further included after the surface grinding process.
The present invention does not have special restriction for the mode of the face coat sealing pores, using table well known to those skilled in the art
The technical solution of finishing coat sealing pores；Present invention preferably employs chemical vapour deposition techniques to carry out the face coat sealing of hole
Processing.In an embodiment of the present invention, specifically by the Carbon deposition that propylene is cracked to form at high temperature after the grinding process of surface
The surface of gained surface polishing blank, obtains charcoal-charcoal thin-walled porous member.In the present invention, the deposition is preferably in vacuum item
It is carried out under part；In the present invention, the deposition carries out preferably in cvd furnace.In the present invention, the temperature of the deposition is preferred
It is 980~1030 DEG C；The time of the deposition is preferably 30~50h, more preferably 35~45h.In the present invention, the deposition
The intake of middle propylene is preferably 50~80L/min, more preferably 60~70L/min.
The charcoal being prepared the present invention provides the preparation method described in above-mentioned technical proposal-charcoal thin-walled porous member.At this
In invention, the thickness of the charcoal-charcoal thin-walled porous member middle hole wall is preferably shorter than 5mm, more preferably 2~3mm.The present invention is for institute
The shape for stating internal holes in charcoal-charcoal thin-walled porous member does not have special restriction, using it is well known to those skilled in the art rule or
Irregular shape, specific such as circle, hexagon, ellipse.The present invention is for the shape of the charcoal-charcoal thin-walled porous member
Shape does not have special restriction, specific such as plank or tubular structure using shape well known to those skilled in the art.The present invention
The method of offer is suitable for preparing large scale charcoal-charcoal thin-walled porous member, specifically, such as when charcoal-charcoal thin-walled porous member is plank,
The size of the charcoal-charcoal thin-walled porous member is：1.5m<It is long<3m, 1m<It is wide<2m.
Below in conjunction with the embodiment in the present invention, the technical solution in the present invention is clearly and completely described.It is aobvious
So, described embodiment is only part of the embodiment of the present invention, instead of all the embodiments.Based on the reality in the present invention
Apply example, those of ordinary skill in the art's all other embodiments obtained without making creative work all belong to
In the scope of protection of the invention.
Fig. 1 is the schematic diagram that charcoal-charcoal thin-wall boards with parallel square hole are prepared using method provided by the invention.External mold
As shown in Figure 1, during solidifying and setting processing, mold core can expand the shape of tool and mold core, and make jointly with external mold
For carbon fiber prepreg, squeezing carbon fiber prepreg makes its compacting-shaping, finally obtains the charcoal with parallel square hole-charcoal thin-walled
Plank.
Embodiment 1
(1) using 2 pieces of top and bottom as external mold of stainless steel plate of 3000*1500*5mm thickness, 3000*100*5mm is not
2 pieces of left and right faces as external mold of rust steel plate will carry out chrome-faced, then hard in one layer of surface spraying after 4 pieces of stainless steel plates cleanings
Resin acid zinc releasing agent makees welding after sealing pores and obtains external mold；The shape of the external mold is as shown in Figure 1；
(2) cutting the modification solid epoxy resin stick of 7 3000*80*200mm, (additive amount of modifying agent polyurethane is
10wt%) as mold core, then by carbon fiber prepreg (charcoal cloth used is 6K plain weave carbon cloths, and pre- impregnation used is phenolic resin,
Content is 45wt%) 7 layers are wound on mold core, obtain precast body；The shape of the mold core is as shown in Figure 1；
(3) precast body is placed in external mold, solidifying and setting processing is carried out in air dry oven, specifically in 2h at the uniform velocity
120 DEG C of the softening temperature of mold core is warming up to, 180 DEG C of the solidification temperature of carbon fiber prepreg is then at the uniform velocity warming up in 0.5h,
It keeps the temperature 2h and stops heating, until air dry oven temperature is taken out after naturally cooling to less than 80 DEG C, remove external mold, obtain solidifying and setting
Body；
(4) solidifying and setting body is heated to 1300 DEG C in nitrogen atmosphere, heat preservation 8h carries out charing process, obtains blank
Part；
(5) blank is heated to 2500 DEG C in argon gas atmosphere, heat preservation 3h carries out graphitization processing, obtains graphitization hair
Blank；
(6) according to the design size cut end mouth of product drawing, then with the sand paper of 600 mesh to the appearance of graphitization blank
Face is polished, and mold core remaining charcoal after graphitizationization processing in its hole that cleans with a brush, and obtains surface polishing blank
Part；
(7) surface polishing blank is subjected to face coat sealing pores, it is heavy to be specifically placed in surface polishing blank
In product stove, it is heated to 1030 DEG C under vacuum, being passed through propylene by the flow of 80L/min carries out chemical vapor deposition 30h, obtains
To charcoal-charcoal thin-walled porous member.
Embodiment 2
(1) 1 piece of the stainless steel plate of 3000*3100*5mm thickness is used to carry out bending process in 3100mm sizes as external mold
Above, the left side and in the following, left side height is 100mm, by the use of 1 piece of right side as external mold of stainless steel plate of 3000*100*5mm, by 2
Chrome-faced is carried out after the cleaning of block stainless steel plate, then in one strata ethylene glycol releasing agent of surface spraying, welded after making sealing pores
Obtain external mold；The shape of the external mold is as shown in Figure 1；
(2) the polymethyl methacrylate stick of 7 3000*80*200mm is cut as mold core, then by carbon fibre initial rinse
Material (charcoal cloth used be 12K plain weave carbon cloths, pre- impregnation used be epoxy resin, content 40wt%) on mold core wind 6 layers, obtain
To precast body；The shape of the mold core is as shown in Figure 1；
(3) precast body is placed in external mold, solidifying and setting processing is carried out in air dry oven, specifically in 2h at the uniform velocity
100 DEG C of the softening temperature of mold core is warming up to, 120 DEG C of the solidification temperature of carbon fiber prepreg is then at the uniform velocity warming up in 0.5h,
It keeps the temperature 2h and stops heating, until air dry oven temperature is taken out after naturally cooling to less than 60 DEG C, remove external mold, obtain solidifying and setting
Body；
(4) solidifying and setting body is heated to 1200 DEG C in nitrogen atmosphere, heat preservation 10h carries out charing process, obtains blank
Part；
(5) blank is heated to 2200 DEG C in argon gas atmosphere, heat preservation 8h carries out graphitization processing, obtains graphitization hair
Blank；
(6) according to the design size cut end mouth of product drawing, then with the sand paper of 600 mesh to the appearance of graphitization blank
Face is polished, and mold core remaining charcoal after graphitization processing in its hole that cleans with a brush, and obtains surface polishing blank；
(7) surface polishing blank is subjected to face coat sealing pores, it is heavy to be specifically placed in surface polishing blank
In product stove, it is heated to 980 DEG C under vacuum, being passed through propylene by the flow of 50L/min carries out chemical vapor deposition 50h, obtains
To charcoal-charcoal thin-walled porous member.
Embodiment 3
(1) using 2 pieces of top and bottom as external mold of mold steel plate of 3000*1500*5mm thickness, the mould of 3000*100*5mm
Have 2 pieces of left and right faces as external mold of steel plate, chrome-faced is carried out after 4 pieces of stainless steel plates are cleaned, then hard in one layer of surface spraying
Resin acid zinc releasing agent makees welding after sealing pores and obtains external mold；The shape of the external mold is as shown in Figure 1；
(2) the polymethyl methacrylate stick of 7 3000*80*200mm is cut as mold core, then by carbon fibre initial rinse
Material (charcoal cloth used be 6K plain weave carbon cloths, pre- impregnation used be phenolic resin, content 45wt%) on mold core wind 7 layers, obtain
To precast body；The shape of the mold core is as shown in Figure 1；
(3) precast body is placed in external mold, solidifying and setting processing is carried out in air dry oven, specifically in 2h at the uniform velocity
100 DEG C of the softening temperature of mold core is warming up to, 160 DEG C of the solidification temperature of carbon fiber prepreg is then at the uniform velocity warming up in 0.5h,
It keeps the temperature 2h and stops heating, until air dry oven temperature is taken out after naturally cooling to less than 60 DEG C, remove external mold, obtain solidifying and setting
Body；
(4) solidifying and setting body is heated to 1200 DEG C in nitrogen atmosphere, heat preservation 10h carries out charing process, obtains blank
Part；
(5) blank is heated to 2200 DEG C in argon gas atmosphere, heat preservation 8h carries out graphitization processing, obtains graphitization hair
Blank；
(6) according to the design size cut end mouth of product drawing, then with the sand paper of 600 mesh to the appearance of graphitization blank
Face is polished, and mold core remaining charcoal after graphitization processing in its hole that cleans with a brush, and it is porous to obtain charcoal-charcoal thin-walled
Part.
As seen from the above embodiment, method provided by the invention is suitable for preparing large scale charcoal-charcoal thin-walled porous member, product
The consistency of quality is good, and with short production cycle, and production cost is low, is easy to large-scale production.
The above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications also should
It is considered as protection scope of the present invention.
Claims (10)
1. a kind of preparation method of charcoal-charcoal thin-walled porous member, includes the following steps：
(1) carbon fiber prepreg is wrapped on mold core, obtains precast body；The material of the mold core is macromolecule solid-state thermal expansion
Material；
(2) precast body in the step (1) is placed in progress solidifying and setting processing in external mold, removes external mold, it is fixed to obtain curing
Type body；
(3) the solidifying and setting body in the step (2) is subjected to charing process, obtains blank；
(4) blank in the step (3) is subjected to graphitization processing, obtains charcoal-charcoal thin-walled porous member.
2. preparation method according to claim 1, which is characterized in that used in the carbon fiber prepreg in the step (1)
Charcoal cloth includes plain weave charcoal cloth, twill charcoal cloth or satin weave charcoal cloth；The specification of the charcoal cloth includes 3K, 6K or 12K.
3. preparation method according to claim 1 or 2, which is characterized in that the carbon fiber prepreg institute in the step (1)
Include phenolic resin, epoxy resin, benzene the third oxazine resin or furane resins with pre- impregnation；Pre- impregnation in the carbon fiber prepreg
Mass content be 40~50%.
4. preparation method according to claim 1, which is characterized in that the macromolecule solid-state thermal expansion in the step (1)
Material includes polyvinyl chloride, polystyrene, polyurethane, polyetherimide, polymethyl methacrylate or modified solid epoxidic tree
Fat.
5. preparation method according to claim 1, which is characterized in that in the step (2) solidifying and setting processing include according to
The first heat treatment and the second heat treatment of secondary progress；First heat treatment is the softening that mold core is at the uniform velocity warming up in 1~2h
Temperature, second heat treatment is the curing temperature for being at the uniform velocity warming up to carbon fiber prepreg from the softening temperature of mold core in 0.5h
Degree keeps the temperature 1~2h.
6. preparation method according to claim 1, which is characterized in that charing process is in protective atmosphere in the step (3)
Middle progress, the temperature of the charing process is 800~1300 DEG C, and the time of the charing process is 3~10h.
7. preparation method according to claim 1, which is characterized in that graphitization processing is in protection gas in the step (4)
It is carried out in atmosphere, the temperature of the graphitization processing is 1800~2500 DEG C, and the time of the graphitization processing is 2~8h.
8. the preparation method according to claim 1 or 7, which is characterized in that also wrapped after graphitization processing in the step (4)
Include surface grinding process.
9. preparation method according to claim 8, which is characterized in that further include face coat after the surface grinding process
Sealing pores.
10. the charcoal that claim 1~9 any one of them preparation method is prepared-charcoal thin-walled porous member.
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| CN112010654A (en) * | 2020-09-11 | 2020-12-01 | 航天特种材料及工艺技术研究所 | Fiber-reinforced silicon nitride composite material and preparation method thereof |
| CN113149684A (en) * | 2021-04-29 | 2021-07-23 | 上海骐杰碳素材料有限公司 | Carbon-carbon or carbon-ceramic composite material winding preform, product and preparation method thereof |
| CN113149683A (en) * | 2021-04-29 | 2021-07-23 | 上海骐杰碳素材料有限公司 | Carbon or carbon ceramic composite material short fiber preform, product and preparation method thereof |
| CN113929484A (en) * | 2021-10-12 | 2022-01-14 | 贵州省紫安新材料科技有限公司 | Preparation method of thin-wall special-shaped composite material component |
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